Thank you for the query.
If this redness
is between the buttocks, most likely you do suffer from pilonidal cyst. This condition is caused by ingrown hair what leads to tissues irritation and local inflammation. If it will get infected, you may have an abscess
in that area.
Other possible reason of your symptoms is rectal fistula
- a connection between the rectum and the skin. It can give pus discharges or even bleedings.
Both conditions can be treated with surgery. It is advisable for you to visit your doctor and start with rectal examination
Hope this will help.